Information Storage Medium and Game-Providing System

1. A non-transitory computer-readable information storage medium storing a game-providing program that provides a game to a plurality of mobile terminals via a network, the game-providing program causing a computer to function as: a virtual event area selection section that selects a virtual event area based on current position information acquired by a mobile terminal among the plurality of mobile terminals, the virtual event area being linked to position information that indicates a position within a predetermined range from a current position obtained from the current position information; an acquisition section that provides a user with information about the virtual event area selected by the virtual event area selection section as acquisition candidate information via a mobile terminal among the plurality of mobile terminals, links the information about the virtual event area to identification information about the user, and causes a memory to store the information about the virtual event area as acquisition information about the user when an acquisition request for the virtual event area indicated by the acquisition candidate information has been received from a mobile terminal among the plurality of mobile terminals; a visit processing section that provides a user with information about the virtual event area selected by the virtual event area selection section as visit candidate information via a mobile terminal among the plurality of mobile terminals, and receives a visit request for the virtual event area indicated by the visit candidate information from a mobile terminal among the plurality of mobile terminals; and a parameter calculation section that calculates at least one of a result value and a game parameter of a user in response to the acquisition request and/or the visit request for the virtual event area, the parameter calculation section changing the result value or the predetermined game parameter of a user for whom the information about the virtual event area is stored as the acquisition information when the visit request for the virtual event area has been received.

2. The information storage medium as defined in claim 1 , wherein the visit processing section causes a memory to store identification information about a user who has issued the visit request for the virtual event area as visit record information linked to the virtual event area when the visit request has been received; and wherein the parameter calculation section determines whether or not the user who has issued the visit request for the virtual event area maintains a friendship with the user for whom the information about the virtual event area is stored as the acquisition information based on the visit record information and friend information that specifies a user who maintains a friendship with another user, and advantageously changes a result value or a predetermined game parameter of the user for whom the information about the virtual event area is stored as the acquisition information when it has been determined that the users are friends, as compared with a case where the users are not friends.

3. The information storage medium as defined in claim 1 , wherein the visit processing section acquires information about a user who maintains a friendship with another user based on the friend information, and provides the other user with information about the virtual event area stored as the acquisition information about the user as the visit candidate information via a mobile terminal among the plurality of mobile terminals.

4. The information storage medium as defined in claim wherein the parameter calculation section changes a result value or a predetermined game parameter of a user who has issued the visit request for the virtual event area when the visit request has been received.

5. The information storage medium as defined in claim 1 , the game-providing program causing the computer to further function as: a cooperator registration section that provides a user with information about another user who maintains a friendship with the user and is registered as a game user, as cooperator candidate information via a mobile terminal among the plurality of mobile terminals, and registers the other user as a cooperator of the user when a cooperation request that designates the other user has been received from the mobile terminal, wherein the parameter calculation section changes at least one of a result value and a game parameter of the user when a cooperator has been registered for the user.

6. The information storage medium as defined in claim 2 , wherein the acquisition section decides whether or not a user who has acquired the selected virtual event area has a friend among other users who have issued acquisition requests for the virtual event area based on the friend information and the acquisition information, and determines a priority for providing the other users with the information via the users' mobile terminals based on the decision result.

7. The information storage medium as defined in claim 1 , the game-providing program causing the computer to further function as: a virtual price calculation section that calculates a virtual price of the virtual event area based on land price information corresponding to the position information, wherein the acquisition section provides a user with information including the virtual price of the selected virtual event area via a mobile terminal among the plurality of mobile terminals.

8. The information storage medium as defined in claim 7 , wherein the parameter calculation section calculates at least one of a result value and a game parameter of a user based on the virtual price of the virtual event area stored as the acquisition information about the user.

9. The information storage medium as defined in claim 7 , wherein the acquisition section selects a virtual event area that is positioned within a predetermined range from the current position and has a virtual price equal to or lower than a given value based on the acquired current position information and the position information linked to the virtual event area, and provides information about the virtual event area as the acquisition candidate information, and wherein the acquisition section selects a virtual event area that has a virtual price equal to or lower than the given value and provides information about the virtual event area as the acquisition candidate information while enlarging the predetermined range stepwise when the virtual event area that has a virtual price equal to or lower than the given value is not included within the predetermined range.

10. The information storage medium as defined in claim 7 , wherein evaluation information that can be updated by another application is stored in a memory and linked to the virtual event area; and wherein the virtual price calculation section calculates the virtual price of the virtual event area based on the evaluation information.

11. The information storage medium as defined in claim 1 , wherein the parameter calculation section increases virtual sales of the virtual event area acquired by a user until an upper-limit value that has been set according to a predetermined condition has been reached; and wherein the parameter calculation section includes a virtual money collection section that allows a user to receive money from the virtual sales and resets the virtual sales when a money collection request for the virtual event area acquired by the user has been received from the mobile terminal.

12. The information storage medium as defined in claim 2 , the game-providing program causing the computer to further function as: an exclusive control section that performs an exclusive control process so that a user cannot acquire a virtual event area that has been acquired by another user who maintains a friendship with the user.

13. The information storage medium as defined in claim 12 , wherein, when a user maintains a friendship with another user who has acquired the virtual event area selected by the virtual event area selection section, the exclusive control section issues a negotiation request to the other user, and when the exclusive control section has received a negotiation acceptance response from the other user, the exclusive control section cancels acquisition of the virtual event area by the other user and allows the user to acquire the virtual event area.

14. A game-providing system that includes a server that provides game to a plurality of mobile terminals via a network, the game-providing system comprising: a virtual event area information storage section that stores virtual event area information including a virtual event area and position information corresponding to the virtual event area; a virtual event area selection section that selects a virtual event area based on current position information acquired by a mobile terminal among the plurality of mobile terminals, the virtual event area being linked to the position information that indicates a position within a predetermined range from a current position obtained from the current position information; an acquisition section that provides a user with information about the virtual event area selected by the virtual event area selection section as acquisition candidate information via a mobile terminal among the plurality of mobile terminals, links the information about the virtual event area to identification information about the user, and causes a memory to store the information about the virtual event area as acquisition information about the user when an acquisition request for the virtual event area indicated by the acquisition candidate information has been received from a mobile terminal among the plurality of mobile terminals; a visit processing section that provides a user with information about the virtual event area selected by the virtual event area selection section as visit candidate information via a mobile terminal among the plurality of mobile terminals, and receives a visit request for the virtual event area indicated by the visit candidate information from a mobile terminal among the plurality of mobile terminals; and a parameter calculation section that calculates at least one of a result value and a game parameter of a user in response to the acquisition request and/or the visit request for the virtual event area, the parameter calculation section changing the result value or the predetermined game parameter of a user for whom the information about the virtual event area is stored as the acquisition information when the visit request for the virtual event area has been received.

15. The game-providing system as defined in claim 14 , further comprising: a user information storage section that stores user information including friend information that specifies a user who maintains a friendship with another user, wherein the visit processing section causes a memory to store identification information about a user who has issued the visit request for the virtual event area as visit record information linked to the virtual event area when the visit request has been received; and wherein the parameter calculation section determines whether or not the user who has issued the visit request for the virtual event area maintains a friendship with the user for whom the information about the virtual event area is stored as the acquisition information based on the visit record information and the friend information, and advantageously changes a result value or a predetermined game parameter of the user for whom the information about the virtual event area is stored as the acquisition information when it has been determined that the users are friends, as compared with a case where the users are not friends.

16. The game-providing system as defined in claim 14 , wherein the visit processing section acquires information about a user who maintains a friendship with another user based on the friend information, and provides the other user with information about the virtual event area stored as the acquisition information about the user as the visit candidate information via a mobile terminal among the plurality of mobile terminals.

17. The game-providing system as defined in claim 14 , wherein the parameter calculation section changes a result value or a predetermined game parameter of a user who has issued the visit request for the virtual event area when the visit request has been received.

18. The game-providing system as defined in claim 14 , further comprising: a land price information storage section that stores land price information corresponding to the position information; and a virtual price calculation section that calculates a virtual price of the virtual event area based on the land price information, wherein the acquisition section provides a user with information including the virtual price of the selected virtual event area via a mobile terminal among the plurality of mobile terminals.

19. The game-providing system as defined in claim 18 , wherein the parameter calculation section increases virtual sales of the virtual event area acquired by a user until an upper-limit value that has been set according to a predetermined condition has been reached; and wherein the parameter calculation section includes a virtual money collection section that allows a user to receive money from the virtual sales and resets the virtual sales when a money collection request for the virtual event area acquired by the user has been received from the mobile terminal.

20. The game-providing system as defined in claim 15 , further comprising: an exclusive control section that performs an exclusive control process so that a user cannot acquire a virtual event area that has been acquired by another user who maintains a friendship with the user.